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	Provedor de dados 42 (2) Autor Bitencourt,Maria de Fátima (1) MEDEIROS,SILVIA R. (1) Nardi,Lauro V.S. (1) Plá-Cid,Jorge (1) Stabel,Larissa Z. (1) VRIEND,SIMON (1) WIEDEMANN-LEONARDOS,CRISTINA M. (1) Mais... Palavra-chave Post-collisional magmatism (2) A-type magmatism (1) Magma mingling (1) Piquiri Syenite Massif (1) Ribeira Belt (1) Ultrapotassic granites (1) Ultrapotassic syenites (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2008 (1) 2001 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Evidence of mingling between contrasting magmas in a deep plutonic environment: the example of Várzea Alegre, in the Ribeira Mobile Belt, Espírito Santo, Brazil 42 MEDEIROS,SILVIA R.; WIEDEMANN-LEONARDOS,CRISTINA M.; VRIEND,SIMON. At the end of the geotectonic cycle that shaped the northern segment of the Ribeira Mobile Belt (Upper Proterozoic to Paleozoic age), a late to post-collisional set of plutonic complexes, consisting of a wide range of lithotypes, intruded all metamorphic units. The Várzea Alegre Intrusive Complex is a post-collisional complex. The younger intrusion consists of an inversely zoned multistage structure envolved by a large early emplaced ring of megaporphyritic charnoenderbitic rocks. The combination of field, petrographic and geochemical data reveals the presence of at least two different series of igneous rocks. The first originated from the partial melting of the mantle. This was previously enriched in incompatible elements, low and intermediate REE and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Magma mingling; Post-collisional magmatism; Ribeira Belt. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100009 Geochemistry and petrogenesis of post-collisional ultrapotassic syenites and granites from southernmost Brazil: the Piquiri Syenite Massif 42 Nardi,Lauro V.S.; Plá-Cid,Jorge; Bitencourt,Maria de Fátima; Stabel,Larissa Z.. The Piquiri Syenite Massif, southernmost Brazil, is part of the post-collisional magmatism related to the Neoproterozoic Brasiliano-Pan-African Orogenic Cycle. The massif is about 12 km in diameter and is composed of syenites, granites, monzonitic rocks and lamprophyres. Diopside-phlogopite, diopside-biotite-augite-calcic-amphibole, are the main ferro-magnesian paragenesis in the syenitic rocks. Syenitic and granitic rocks are co-magmatic and related to an ultrapotassic, silica-saturated magmatism. Their trace element patterns indicate a probable mantle source modified by previous, subduction-related metasomatism. The ultrapotassic granites of this massif were produced by fractional crystallization of syenitic magmas, and may be considered as a particular... Tipo: Info:eu-repo/semantics/article Palavras-chave: Post-collisional magmatism; Ultrapotassic syenites; Ultrapotassic granites; A-type magmatism; Piquiri Syenite Massif. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200014 Registros recuperados: 2 Primeira ... 1 ... Última

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